Input/Output Base Address

PC/AT互換機のIO Base Address。

最近のマザーボードでは、 Floppy Disk Controller, Serial Port Controller, Keyboard Controller, Parallel Port Controller等のレガシー インターフェースは、Super I/O Chipとして1chipに実装されている。

000-00F
DMA controller #1 (DMAC1) Intel 8237A5 DMA Controller DataSheet
000 Channel 0 Current Address Register byte R
Channel 0 Base/Current Address Register byte W
001 Channel 0 Current Word Count Register byte R
Channel 0 Base/Current Word Count Register byte W
002 Channel 1 Current Address Register byte R
Channel 1 Base/Current Address Register byte W
003 Channel 1 Current Word Count Register byte R
Channel 1 Base/Current Word Count Register byte W
004 Channel 2 Current Address Register byte R
Channel 2 Base/Current Address Register byte W
005 Channel 2 Current Word Count Register byte R
Channel 2 Base/Current Word Count Register byte W
006 Channel 3 Current Address Register byte R
Channel 3 Base/Current Address Register byte W
007 Channel 3 Current Word Count Register byte R
Channel 3 Base/Current Word Count Register byte W
008 Status Register byte R
Command Register byte W
009 Request register byte W
00A Mask register byte W
00B Mode register byte W
00C Clear MSB/LSB flip flop byte W
00D Temporary Register byte R
Master Clear (DMAC reset) byte W
00E Clear mask register byte W
00F Multiple mask register byte W
010-01F
Reserved
020-02F
Master Programmable Interrupt Controller (PIC1) Intel 8259A Programmable Interrupt Controller DataSheet
020 Interrupt Request Register(IRR)/In-Service Register(ISR) byte R
Operation Command Word2/3(OCW2/3)
Initialization Command Word1(ICW1)		 byte W
021 Interrupt Mask Register(IMR) byte R
OCW1/ICW2/ICW3/ICW4 byte W
022-02F Reserved ---- -
030-03F
Reserved
040-05F
8253 or 8254 Programmable Interval Timer (PIT) Intel 8254 Programmable Interval Timer DataSheet
040 8253 channel 0, counter divisor byte R/W
041 8253 channel 1, RAM refresh counter byte R/W
042 8253 channel 2, Cassette and speaker functions byte R/W
043 8253 Mode Control byte W
044 8254 PS/2 Extended Timer byte ?
045 Reserved ---- -
046 Reserved ---- -
047 8254 Channel 3 control byte byte -
048 EISA only byte -
049-05F Reserved ---- -
060
Keyboard Controller (KBC) Intel 8042 Keyboard Controller (From IBM Technical Reference Manual)
060 Keyboard Input Buffer Register byte R
Keyboard Output Buffer Register byte W
061
Programmable Peripheral Interface Controller (PPI) 82C55A Programmable Peripheral Interface Controller
061 Port B System Status 
 bit 0      ?
 bit 1      ?
 bit 2      ?
 bit 3      ?
 bit 4      ?
 bit 5      ?
 bit 6      ?
 bit 7      ?
byte R
Port B System Command 
 bit 0      1:Timer 2 gate to speaker enabl
 bit 1      1:Speaker data enable
 bit 2      ?
 bit 3      ?
 bit 4      unused
 bit 5      unused
 bit 6      unused
 bit 7      unused
byte W
062-06F
Keyboard Controller (KBC)
062 Reserved ---- -
063 Reserved ---- -
064 Status Register byte R
Command Register byte W
065-06F Reserved ---- -
070-07F
Real Time Clock, NMI mask
070 RTC,NMI enable/disable byte R
071 RTC data byte R/W
072-07F Reserved ---- ----
080-09F
DMA Page Register, 74LS612 74LS612 DataSheet
080 Manufacturer systems checkpoint port (used during POST) byte W
081 DMA Channel 2 Upper Address byte W
082 DMA Channel 3 Upper Address byte W
083 DMA Channel 1 Upper Address byte W
084 Reserved ---- ----
085 Reserved ---- ----
086 Reserved ---- ----
087 DMA Channel 0 Upper Address byte W
088 Reserved ---- ----
089 DMA Channel 6 Upper Address byte W
08A DMA Channel 7 Upper Address byte W
08B DMA Channel 5 Upper Address byte W
08C Reserved ---- ----
08D Reserved ---- ----
08F Upper Address When RAM Reflash byte W
0A0-0AF
Second Programmable Interrupt Controller (PIC2) Intel 8259A Programmable Interrupt Controller DataSheet
0A0 Interrupt Request Register(IRR)/In-Service Register(ISR) byte R
Operation Command Word2/3(OCW2/3)
Initialization Command Word1(ICW1)		 byte W
0A1 Interrupt Mask Register(IMR) byte R
OCW1/ICW2/ICW3/ICW4 byte W
0A2-0AF Reserved ---- -
0B0-0BF
Reserved
0C0-0DF
DMA controller #2 (DMAC2) Intel 8237A5 DMA Controller DataSheet
0C0 Channel 0 Current Address Register byte R
Channel 0 Base/Current Address Register byte W
0C2 Channel 0 Current Word Count Register byte R
Channel 0 Base/Current Word Count Register byte W
0C4 Channel 1 Current Address Register byte R
Channel 1 Base/Current Address Register byte W
0C6 Channel 1 Current Word Count Register byte R
Channel 1 Base/Current Word Count Register byte W
0C8 Channel 2 Current Address Register byte R
Channel 2 Base/Current Address Register byte W
0CA Channel 2 Current Word Count Register byte R
Channel 2 Base/Current Word Count Register byte W
0CC Channel 3 Current Address Register byte R
Channel 3 Base/Current Address Register byte W
0CE Channel 3 Current Word Count Register byte R
Channel 3 Base/Current Word Count Register byte W
0D0 Status Register byte R
Command Register byte W
0D2 Request register byte W
0D4 Mask register byte W
0D6 Mode register byte W
0D8 Clear MSB/LSB flip flop byte W
0CA Temporary Register byte R
Master Clear (DMAC reset) byte W
0DC Clear mask register byte W
0DE Multiple mask register byte W
0DF Reserved ---- -
0E0-0EF
Reserved
0F0-0FF
Math coprocessor
0F0 Clear Math coprocessor Busy byte W
0F1 Reset Math coprocessor Busy byte W
0F2-0F7 Reserved ---- -
0F8-0FF Math coprocessor register ---- ----
100-16F
Reserved
140-15F
Secondary SCSI host adapter ?
170-17F
Secondary Parallel ATA Disk Controller (ATA2)
170 Data Register word R/W
171 Error Register byte R
Features Register byte W
172 Sector Count Register byte R/W
173 Sector Number Register byte R/W
174 Cylinder Low Register byte R/W
175 Cylinder High Register byte R/W
176 Drive/Head Register byte R/W
177 Status Register byte R
Command Register byte W
178-17F Reserved ---- -
180-1EF
Reserved
1F0-1FF
Primary Parallel ATA Disk Controller (ATA1)
1F0 Data Register word R/W
1F1 Error Register byte R
Features Register byte W
1F2 Sector Count Register byte R/W
1F3 Sector Number Register byte R/W
1F4 Cylinder Low Register byte R/W
1F5 Cylinder High Register byte R/W
1F6 Drive/Head Register byte R/W
1F7 Status Register byte R
Command Register byte W
1F8-1FF Reserved ---- -
200-20F
Game Adapter
201 Joysticks 
 bit 0      joystick a, x coord (0 = timing active)
 bit 1      joystick a, y coord (0 = timing active)
 bit 2      joystick b, x coord (0 = timing active)
 bit 3      joystick b, y coord (0 = timing active)
 bit 4      joystick a, button 1 (0=pressed)
 bit 5      joystick a, button 2 (0=pressed)
 bit 6      joystick b, button 1 (0=pressed)
 bit 7      joystick b, button 2 (0=pressed)
byte R
Paddles 
 bit 0      Paddles a, x coord (0 = timing active)
 bit 1      Paddles a, y coord (0 = timing active)
 bit 2      Paddles b, x coord (0 = timing active)
 bit 3      Paddles b, y coord (0 = timing active)
 bit 4      Paddles a, button 1 (0=pressed)
 bit 5      Paddles a, button 2 (0=pressed)
 bit 6      Paddles b, button 1 (0=pressed)
 bit 7      Paddles b, button 2 (0=pressed)
byte R
210-277
Reserved
278-27F
Parallel Port (LPT2) Intel UM82C11-C.pdf Parallel Port Controller DataSheet
278 Printer Data Output 
 bit 0      hardware pin 2
 bit 1      hardware pin 3
 bit 2      hardware pin 4
 bit 3      hardware pin 5
 bit 4      hardware pin 6
 bit 5      hardware pin 7
 bit 6      hardware pin 8
 bit 7      hardware pin 9
byte R
279 Printer Status Register 
 bit 0      1=time-out
 bit 1      unused
 bit 2      unused
 bit 3      1=error,        hardware pin 15
 bit 4      1=on-line,      hardware pin 13
 bit 5      1=out of paper, hardware pin 12
 bit 6      0=Acknowledge,  hardware pin 10
 bit 7      0=busy,         hardware pin 11
byte R/W
279 Printer Control Register 
 bit 0      1=output data to printer,  hardware pin 1
 bit 1      1=auto line feed,          hardware pin 14
 bit 2      0=initialize printer,      hardware pin 16
 bit 3      1=printer reads output,    hardware pin 17
 bit 4      0=IRQ disable,1=IRQ enable for ACK
 bit 5      unused
 bit 6      unused
 bit 7      unused
byte R/W
280-2AF
Reserved
2B0-2DF
Alternate EGA, or 3270 PC video ?
2E0
Alternate EGA/VGA ?
2E1
GPIB Adapter ?
2E2-2E3
Data acquisition adapter ?
2E4-2E7
Reserved
2E8-2EF
Serial Port (COM4) PC16550D Universal Asynchronous Receiver/Transmitter with FIFOs
2E8 Receiver Buffer Register byte R
Transmitter Holding Register byte W
2E9 Interrupt Enable Register byte R/W
2EA Interrupt Identification Register byte R
FIFO Control Register byte W
2EB Line Control Register byte R/W
2EC MODEM Control Register byte R/W
2ED Line Status Register byte R
2EE MODEM Status Register byte R
2EF Scratch Register byte R/W
2F0-2F7
Reserved
2F8-2FF
Serial Port (COM2) PC16550D Universal Asynchronous Receiver/Transmitter with FIFOs
2F8 Receiver Buffer Register byte R
Transmitter Holding Register byte W
2E9 Interrupt Enable Register byte R/W
2FA Interrupt Identification Register byte R
FIFO Control Register byte W
2FB Line Control Register byte R/W
2FC MODEM Control Register byte R/W
2FD Line Status Register byte R
2FE MODEM Status Register byte R
2FF Scratch Register byte R/W
300-31F
Prototype Experimentation Card ?
320-370
Reserved
370-375
Floppy Disk Controller #2 (FDC2) Intel 82077AA Floppy Disk Controller DataSheet
370 Reserved ---- -
371 Reserved ---- -
372 Digital Output Register byte W
373 Reserved ---- -
374 Main Status Register byte W
375 Data Register byte R/W
376
Secondary Parallel ATA Disk Controller (ATA2)
376 Alternate Status Register byte R
Device Control Register byte W
377
Floppy Disk Controller #2 (FDC2)
370 Digital Input Register(DIR) byte R
Data Rate Select Register(DSR) byte R
378-37F
Parallel Port (LPT1) UM82C11-C Parallel Port Controller DataSheet
378 Printer Data Output 
 bit 0      hardware pin 2
 bit 1      hardware pin 3
 bit 2      hardware pin 4
 bit 3      hardware pin 5
 bit 4      hardware pin 6
 bit 5      hardware pin 7
 bit 6      hardware pin 8
 bit 7      hardware pin 9
byte R
379 Printer Status Register 
 bit 0      1=time-out
 bit 1      unused
 bit 2      unused
 bit 3      1=error,        hardware pin 15
 bit 4      1=on-line,      hardware pin 13
 bit 5      1=out of paper, hardware pin 12
 bit 6      0=Acknowledge,  hardware pin 10
 bit 7      0=busy,         hardware pin 11
byte R/W
379 Printer Control Register 
 bit 0      1=output data to printer,  hardware pin 1
 bit 1      1=auto line feed,          hardware pin 14
 bit 2      0=initialize printer,      hardware pin 16
 bit 3      1=printer reads output,    hardware pin 17
 bit 4      0=IRQ disable,1=IRQ enable for ACK
 bit 5      unused
 bit 6      unused
 bit 7      unused
byte R/W
380-3AF
Reserved
3B0-3BF
Monochrome Display Adapter
3B0 Port Address Decodes to 3B4 ---- ----
3B1 Port Address Decodes to 3B5 ---- ----
3B2 Port Address Decodes to 3B4 ---- ----
3B3 Port Address Decodes to 3B5 ---- ----
3B4 6845 Index Register ---- ----
3B5 6845 Data Register ---- ----
3B6 Port Address Decodes to 3B4 ---- ----
3B7 Port Address Decodes to 3B5 ---- ----
3B8 6845 Mode Control Register ---- ----
3B9 Reserved For Color Select Register on Color Adapter ---- ----
3BA Status Register ---- ----
3BB Reserved For Light Pen Strobe Reset ---- ----
3BC-3BF
Parallel Port (LPT3) UM82C11-C Parallel Port Controller DataSheet
3BC Printer Data Output 
 bit 0      hardware pin 2
 bit 1      hardware pin 3
 bit 2      hardware pin 4
 bit 3      hardware pin 5
 bit 4      hardware pin 6
 bit 5      hardware pin 7
 bit 6      hardware pin 8
 bit 7      hardware pin 9
byte R
3BD Printer Status Register 
 bit 0      1=time-out
 bit 1      unused
 bit 2      unused
 bit 3      1=error,        hardware pin 15
 bit 4      1=on-line,      hardware pin 13
 bit 5      1=out of paper, hardware pin 12
 bit 6      0=Acknowledge,  hardware pin 10
 bit 7      0=busy,         hardware pin 11
byte R/W
3BE Printer Control Register 
 bit 0      1=output data to printer,  hardware pin 1
 bit 1      1=auto line feed,          hardware pin 14
 bit 2      0=initialize printer,      hardware pin 16
 bit 3      1=printer reads output,    hardware pin 17
 bit 4      0=IRQ disable,1=IRQ enable for ACK
 bit 5      unused
 bit 6      unused
 bit 7      unused
byte R/W
3C0-3CF
EGA/VGA
3C0 VGA attribute and sequencer register ---- -
3C1 Other video attributes ---- -
3C2 EGA, VGA, CGA input status 0 ---- -
3C3 Video subsystem enable ---- -
3C4 CGA, EGA, VGA sequencer index ---- -
3C5 CGA, EGA, VGA sequencer ---- -
3C6 VGA video DAC PEL mask ---- -
3C7 VGA video DAC state ---- -
3C8 VGA video DAC PEL address ---- -
3C9 VGA video DAC ---- -
3CA VGA graphics 2 position ---- -
3CC VGA graphics 1 position ---- -
3CD VGA feature control ---- -
3CE VGA graphics index ---- -
3CF Other VGA graphics ---- -
3D0-3DF
Color Graphics Monitor Adapter
3D0 port address decodes to 3D4 ---- -
3D1 port address decodes to 3D5 ---- -
3D2 port address decodes to 3D4 ---- -
3D3 port address decodes to 3D5 ---- -
3D4 6845 index register ---- -
3D5 6845 data register ---- -
3D6 port address decodes to 3D4 ---- -
3D7 port address decodes to 3D5 ---- -
3D8 6845 Mode control register ---- -
3D9 color select palette register ---- -
3DA status register ---- -
3DB Clear light pen latch ---- -
3DC Preset Light pen latch ---- -
3DF Reserved ? ---- -
3E8-3EF
Serial Port (COM3) PC16550D Universal Asynchronous Receiver/Transmitter with FIFOs
3E8 Receiver Buffer Register byte R
Transmitter Holding Register byte W
3E9 Interrupt Enable Register byte R/W
3EA Interrupt Identification Register byte R
FIFO Control Register byte W
3EB Line Control Register byte R/W
3EC MODEM Control Register byte R/W
3ED Line Status Register byte R
3EE MODEM Status Register byte R
3EF Scratch Register byte R/W
3F0-3F5
Floppy Disk Controller #1 (FDC1) Intel 82077AA Floppy Disk Controller DataSheet
3F0 Reserved ---- -
3F1 Reserved ---- -
3F2 Digital Output Register byte W
3F3 Reserved ---- -
3F4 Main Status Register byte W
3F5 Data Register byte R/W
3F6
Primary Parallel ATA Disk Controller (ATA1)
3F6 Alternate Status Register byte R
Device Control Register byte W
3F7
Floppy Disk Controller #1 (FDC1)
3F7 Digital Input Register(DIR) byte R
Data Rate Select Register(DSR) byte R
3F8-3FF
Serial Port (COM1) PC16550D Universal Asynchronous Receiver/Transmitter with FIFOs
3F8 Receiver Buffer Register byte R
Transmitter Holding Register byte W
3F9 Interrupt Enable Register byte R/W
3FA Interrupt Identification Register byte R
FIFO Control Register byte W
3FB Line Control Register byte R/W
3FC MODEM Control Register byte R/W
3FD Line Status Register byte R
3FE MODEM Status Register byte R
3FF Scratch Register byte R/W
400-CF7
Reserved
Last modified: Thu Jun 05 23:35:07 2008 JST